Re: [PATCH 27/33] dma-direct: use node local allocations for coherent memory
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- To: Robin Murphy <robin.murphy@xxxxxxx>
- Subject: Re: [PATCH 27/33] dma-direct: use node local allocations for coherent memory
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Wed, 10 Jan 2018 16:30:17 +0100
- Cc: Christoph Hellwig <hch@xxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, Guan Xuetao <gxt@xxxxxxxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-c6x-dev@xxxxxxxxxxxxx, linux-hexagon@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>, linux-snps-arc@xxxxxxxxxxxxxxxxxxx, linux-m68k@xxxxxxxxxxxxxxx, patches@xxxxxxxxxxxxxxxx, linux-metag@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Michal Simek <monstr@xxxxxxxxx>, linux-parisc@xxxxxxxxxxxxxxx, linux-cris-kernel@xxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-alpha@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx
- In-reply-to: <3672aa56-b85c-5d2c-0c0e-709031b0c0a0@arm.com>
- References: <20180110080027.13879-1-hch@lst.de> <20180110080027.13879-28-hch@lst.de> <3672aa56-b85c-5d2c-0c0e-709031b0c0a0@arm.com>
- User-agent: Mutt/1.5.17 (2007-11-01)
On Wed, Jan 10, 2018 at 12:06:22PM +0000, Robin Murphy wrote:
> On 10/01/18 08:00, Christoph Hellwig wrote:
>> To preserve the x86 behavior.
>
> And combined with patch 10/22 of the SWIOTLB refactoring, this means
> SWIOTLB allocations will also end up NUMA-aware, right? Great, that's what
> we want on arm64 too :)
Well, only for swiotlb allocations that can be satisfied by
dma_direct_alloc. If we actually have to fall back to the swiotlb
buffers there is not node affinity yet.
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